Nucleation of Ice on Silver Iodide

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  • 1 Dept. of Physics, State University of New York College at Fredonia
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Abstract

It is shown that a constant nucleation rate implies a nearly constant supercooling. This is confirmed experimentally by observing the nucleation of ice and water on single AgI crystals. The experimentally determined supercoolings for condensation and deposition, when plotted on a T vs logP graph, allow the determination of the threshold for deposition (˜−5C at ˜3% supersaturation). The threshold for deposition at water saturation is found to be −9C.

Three nucleation threshold temperatures are of interest. The first is that at which the transition from condensation to deposition occurs, the second that at which deposition first occurs at water saturation, and the third that at which liquid water in contact with the nucleus freezes. Only the first two are considered in this paper.

Abstract

It is shown that a constant nucleation rate implies a nearly constant supercooling. This is confirmed experimentally by observing the nucleation of ice and water on single AgI crystals. The experimentally determined supercoolings for condensation and deposition, when plotted on a T vs logP graph, allow the determination of the threshold for deposition (˜−5C at ˜3% supersaturation). The threshold for deposition at water saturation is found to be −9C.

Three nucleation threshold temperatures are of interest. The first is that at which the transition from condensation to deposition occurs, the second that at which deposition first occurs at water saturation, and the third that at which liquid water in contact with the nucleus freezes. Only the first two are considered in this paper.

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